CN205017222U - Switching power supply and electronic equipment - Google Patents
Switching power supply and electronic equipment Download PDFInfo
- Publication number
- CN205017222U CN205017222U CN201520727979.2U CN201520727979U CN205017222U CN 205017222 U CN205017222 U CN 205017222U CN 201520727979 U CN201520727979 U CN 201520727979U CN 205017222 U CN205017222 U CN 205017222U
- Authority
- CN
- China
- Prior art keywords
- transformer
- power supply
- switching power
- output
- siding ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model discloses a switching power supply and electronic equipment, this switching power supply includes the transformer, be connected with the primary of transformer, with the supply circuit who provides working power supply for the transformer, a current transformer, a load resistance and output holding circuit, the side line circle of current transformer on the secondary ground loop who locates the transformer has a load resistance's secondary side coil with connecting in parallel, side line circle is used for sampling to the current signal that the secondary ground loop of transformer flows past, voltage signal and the output of electric current signal conversion for corresponding that the secondary side coil will be sampled through a load resistance, output holding circuit and secondary side winding connection for maintain the voltage signal permanent output. The utility model discloses technical scheme has the advantage that circuit structure is simple.
Description
Technical field
The utility model relates to power technique fields, particularly a kind of Switching Power Supply and electronic equipment.
Background technology
Switching Power Supply is little, lightweight and efficiency advantages of higher and be widely used in various electronic equipment with its volume.The working method of Switching Power Supply is the break-make by controller control switch pipe, exports with driving transformer.Ensure that transformer is stable to export, usually need to sample to the output current of transformer, and according to the output voltage of the Current adjustment transformer sampled.In addition, the electric current that transformer exports is sampled, transformer whether output overcurrent can also be known timely, with the output of the timely disconnecting transformer when transformer output overcurrent, to protect.
Existing Switching Power Supply generally adopts resistance to realize current sample.Wherein, resistance is serially connected in the grounded circuit of transformer; controller is sent to after utilizing resistance the current signal flow through on it to be converted to corresponding voltage signal; controller just can according to the output voltage of the voltage signal adjustment transformer of feedback; make stable output; simultaneously when overcurrent, also can the output of disconnecting transformer, to realize the object protected.
But adopt the mode of this resistance sampling, the voltage signal obtained of sampling is negative voltage signal relative to power supply, and the controller of Switching Power Supply can only process positive voltage signal, therefore also need to arrange complicated change-over circuit to convert negative voltage signal to positive voltage signal, make circuit structure more complicated.
Utility model content
Main purpose of the present utility model is to provide a kind of Switching Power Supply, is intended to the circuit structure simplifying Switching Power Supply.
For achieving the above object, the utility model proposes a kind of Switching Power Supply, this Switching Power Supply comprises transformer, be connected with the primary coil of described transformer, with the power supply circuits providing working power to described transformer, described Switching Power Supply also comprises current transformer, first load resistance and output holding circuit, described current transformer comprises the first siding ring be located on the secondary grounded circuit of described transformer and the second siding ring being parallel with described first load resistance, described first siding ring is sampled in order to the current signal flow through the secondary grounded circuit of described transformer, the current signal sampled to be converted to corresponding voltage signal by described first load resistance and to export by described second siding ring, described output holding circuit is connected with described second siding ring, continues to export in order to maintain described voltage signal.
Preferably, described output holding circuit is voltage follower, one end that second end of the normal phase input end of described voltage follower and described first load resistance and described second siding ring is connected connects, and the inverting input of described voltage follower is connected with its output.
Preferably, described Switching Power Supply also comprises control circuit, one end that second end of the test side of described control circuit and described first load resistance and described second siding ring is connected connects, and the control end of described control circuit is connected with the controlled end of described voltage follower; Described control circuit, whether reverse for the voltage signal detecting the output of described current transformer, and when the voltage signal that described current transformer exports is reverse, cut off the output of described voltage follower.
Preferably, described control circuit comprises operational amplifier, the in-phase input end of described operational amplifier is connected with the second end of described second siding ring, the reverse inter-input-ing ending grounding of described operational amplifier, and the output of described operational amplifier is the control end of described control circuit.
Preferably, described voltage follower and described operational amplifier adopt amplifier chip to realize respectively.
Preferably, described Switching Power Supply also comprises the first diode, the second diode and the first electric capacity, the anode of described first diode is connected with the first output of the secondary coil of described transformer, and the negative electrode of described first diode is the output of described Switching Power Supply; The anode of described second diode is connected with the second output of the secondary coil of described transformer, and the negative electrode of described second diode is connected with the negative electrode of described first diode; The first end of described first electric capacity is connected with the negative electrode of described first diode, the second end ground connection of described first electric capacity.
In addition, for achieving the above object, the utility model also provides a kind of electronic equipment, described electronic equipment comprises Switching Power Supply as above, described Switching Power Supply comprises transformer, be connected with the primary coil of described transformer, with the power supply circuits providing working power to described transformer, described Switching Power Supply also comprises current transformer, first load resistance and output holding circuit, described current transformer comprises the first siding ring be located on the secondary grounded circuit of described transformer and the second siding ring being parallel with described first load resistance, described first siding ring is sampled in order to the current signal flow through the secondary grounded circuit of described transformer, the current signal sampled to be converted to corresponding voltage signal by described first load resistance and to export by described second siding ring, described output holding circuit is connected with described second siding ring, continues to export in order to maintain described voltage signal.
Technical solutions of the utility model are by arranging transformer, being connected provide the power supply circuits of working power, current transformer, the first load resistance to described transformer and export the Switching Power Supply that holding circuit achieves a kind of simplification with the primary coil of described transformer.Wherein current transformer comprises the first siding ring be located on the secondary grounded circuit of described transformer and the second siding ring being parallel with described first load resistance, described first siding ring is sampled in order to the current signal flow through the secondary grounded circuit of described transformer, and the current signal sampled to be converted to corresponding voltage signal by described first load resistance and to export by described second siding ring; Described output holding circuit is connected with described second siding ring, continues to export in order to maintain described voltage signal.Be understandable that, sample owing to adopting the current signal that the secondary grounded circuit of current transformer to transformer flows through in Switching Power Supply, make the voltage signal exported be forward voltage signal, change without the need to corresponding change-over circuit, thus simplify the circuit structure of Switching Power Supply.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model Switching Power Supply one embodiment;
Fig. 2 is the electrical block diagram of another embodiment of the utility model Switching Power Supply.
Drawing reference numeral illustrates:
| Label | Title | Label | Title |
| 10 | Power supply circuits | D2 | Second diode |
| 20 | Export holding circuit | C1 | First electric capacity |
| 30 | Control circuit | R1 | First load resistance |
| T | Transformer | U1 | Voltage follower |
| TA | Current transformer | U2 | Operational amplifier |
| D1 | First diode |
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Be described further with regard to the technical solution of the utility model below in conjunction with drawings and the specific embodiments.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model proposes a kind of Switching Power Supply.
With reference to Fig. 1 and Fig. 2, in the utility model embodiment, this Switching Power Supply comprises transformer T, is connected provide the power supply circuits 10 of working power, current transformer TA, the first load resistance R1 to described transformer T and export holding circuit 20 with the primary coil of described transformer T.Wherein, current transformer TA comprises the first siding ring on the secondary grounded circuit being located at described transformer T and is parallel with the second siding ring of described first load resistance R1, described first siding ring is sampled in order to the current signal flow through the secondary grounded circuit of described transformer T, and the current signal sampled to be converted to corresponding voltage signal by described first load resistance R1 and to export by described second siding ring; Described output holding circuit 20 is connected with described second siding ring, continues to export in order to maintain described voltage signal.
In the present embodiment, the AC power of access is carried out filtering, rectification by power supply circuits 10, and exports the secondary of transformer T to after converting square-wave voltage to, to realize providing working power to transformer.
In the present embodiment, current transformer TA utilizes electromagnetic induction principle, the electric current of current transformer TA primary side is sensed the secondary side of current transformer TA, the induced current of secondary side is much less than primary side, current transformer TA is made up of the iron core closed and winding, internal driving is very little, therefore the power loss of itself is also very little, the electric current flowing through described first load resistance R1 is very little, also loss is very little for power on described first load resistance R1, makes the loss of whole senser sampling circuit little.Wherein, the second siding ring of transformer T comprises first end and the second end, the first end ground connection of described current transformer TA second siding ring, and the second end is connected 20 with described output holding circuit; The first end of described first load resistance R1 is connected with the first end of described current transformer TA second siding ring, and second end of described first load resistance R1 is connected with the second end of described current transformer TA second siding ring, with output voltage signal.
It should be noted that, the current signal that the secondary grounded circuit of first siding ring to described transformer T of current transformer TA flows through is sampled as positive current signal, and the current signal sampled to be converted to corresponding voltage signal by the first load resistance R1 and to export by second siding ring.
Wherein, the voltage signal of output is discontinuous, needs to export holding circuit 20 and maintains the lasting output of described voltage signal, to be supplied to corresponding transformer drive circuit in power supply circuits 10, and then regulate the output of transformer, make transformer T stable output.This output holding circuit 20 can adopt the circuit realiration realizing arbitrarily its function, preferably adopts voltage follower U1 to realize in the present embodiment.Wherein, one end that the second end of the normal phase input end of described voltage follower U1 and described first load resistance R1 and described second siding ring is connected connects, and the inverting input of described voltage follower U1 is connected with its output.Voltage follower U1 can play the effect of buffering, can improve the load capacity of current transformer TA output voltage signal simultaneously.
Technical solutions of the utility model, by arranging transformer T, being connected with the primary coil of described transformer T to provide the power supply circuits 10 of working power, current transformer TA, the first load resistance R1 to described transformer T and to export holding circuit 20, achieve a kind of Switching Power Supply.Wherein said current transformer TA comprises the first siding ring on the secondary grounded circuit being located at described transformer T and is parallel with the second siding ring of described first load resistance R1, described first siding ring is sampled in order to the current signal flow through the secondary grounded circuit of described transformer T, and the current signal sampled to be converted to corresponding voltage signal by described first load resistance R1 and to export by described second siding ring; Described output holding circuit 20 is connected with described second siding ring, continue to export in order to maintain described voltage signal, be understandable that, sample owing to adopting the current signal that the secondary grounded circuit of current transformer TA to transformer T flows through in Switching Power Supply, the voltage signal exported is made to be forward voltage signal, change without the need to corresponding change-over circuit, thus simplify the circuit structure of Switching Power Supply.
Further, described Switching Power Supply also comprises control circuit 30, one end that second end of the test side of described control circuit 30 and described first load resistance R1 and described second siding ring is connected connects, and the control end of described control circuit 30 is connected with the controlled end of described voltage follower U1; Described control circuit 30, whether reverse for the voltage signal detecting described current transformer TA output, and when the voltage signal that described current transformer TA exports is reverse, cut off the output of described voltage follower U1.
With reference to Fig. 2, particularly, described control circuit 30 comprises operational amplifier U2, the in-phase input end of described operational amplifier U2 is connected with the second end end of described second siding ring, the reverse inter-input-ing ending grounding of described operational amplifier U2, the output of described operational amplifier U2 is the control end of described control circuit 30.
It should be noted that, described operational amplifier U2 is when the input input voltage signal of described current transformer TA second siding ring is positive voltage, the output of described operational amplifier U2 exports high level, described voltage follower U1 normally works, and keeps the voltage signal that output current transformer TA second siding ring samples; Described operational amplifier U2 is when the input input voltage signal of described current transformer TA secondary side is negative voltage, the output output low level of described operational amplifier U2, the voltage signal that now second siding ring exports is external interference signals, and described voltage follower U1 quits work no longer output voltage signal.
Described voltage follower U1 and described operational amplifier U2 can be that discharge circuit realizes, and the amplifier chip of specialty also can be adopted to realize, and preferably adopts amplifier chip that is reliable and stable, that be simply easy to realize to realize in the present embodiment.
Further, described Switching Power Supply also comprises the first diode D1, the second diode D2 and the first electric capacity C1, the anode of described first diode D1 is connected with the first output of the secondary coil of described transformer T, and the negative electrode of described first diode D1 is the output of described Switching Power Supply; The anode of described second diode D2 is connected with the second output of the secondary coil of described transformer T, and the negative electrode of described second diode D2 is connected with the negative electrode of described first diode D1; The first end of described first electric capacity C1 is connected with the negative electrode of described first diode D1, the second end ground connection of described first electric capacity C1, described first diode D1 and described second diode D2 can reverse direction current flow in limit circuit, described first electric capacity C1 can stablize described switch power source output voltage, reduces the ripple that Switching Power Supply exports.
In sum, in an output current sampling period of Switching Power Supply, the primary side of current transformer TA is sampled to the electric current in transformer T output loop, and the voltage signal that the current signal of sampling converts correspondence to by the first load resistance R1 is exported at the secondary side of current transformer TA, if the voltage signal that current transformer TA secondary side exports is positive voltage signal, then described control circuit 30 exports the controlled end of high level to described voltage follower U1 device, described voltage follower U1 normally works, the voltage signal Vout exported by current transformer TA secondary side keeps exporting described power supply circuits 10 to, to regulate the output voltage of described transformer T, if the voltage signal that current transformer TA secondary side exports is negative voltage signal, then described control circuit 30 output low level is to the controlled end of described voltage follower U1, and described voltage follower U1 quits work, to prevent external electromagnetic interference.The output voltage amplitude of described current transformer TA can be heightened flexibly, the antijamming capability that current transformer TA samples can be strengthened, the utility model adopts current transformer TA to instead of traditional resistance sampling circuit, thus achieving a kind of Switching Power Supply of simplification, this Switching Power Supply also has feature low in energy consumption simultaneously.
The utility model also proposes a kind of electronic equipment, this electronic equipment comprises Switching Power Supply, the concrete structure of this Switching Power Supply is with reference to above-described embodiment, because this electronic equipment have employed whole technical schemes of above-mentioned all embodiments, therefore all beneficial effects that the technical scheme having above-described embodiment is equally brought, this is no longer going to repeat them.
Should be noted that; the technical scheme of each embodiment of the present utility model can be combined with each other; but must be can be embodied as basis with those skilled in the art; when technical scheme combination occur conflicting maybe cannot realize time will be understood that the combination of this technical scheme does not exist, also not the utility model require protection range within.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalent structure transformation utilizing the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (7)
1. a Switching Power Supply, comprise transformer, be connected with the primary coil of described transformer, with the power supply circuits providing working power to described transformer, it is characterized in that, described Switching Power Supply also comprises current transformer, first load resistance and output holding circuit, described current transformer comprises the first siding ring be located on the secondary grounded circuit of described transformer and the second siding ring being parallel with described first load resistance, described first siding ring is sampled in order to the current signal flow through the secondary grounded circuit of described transformer, the current signal sampled to be converted to corresponding voltage signal by described first load resistance and to export by described second siding ring, described output holding circuit is connected with described second siding ring, continues to export in order to maintain described voltage signal.
2. Switching Power Supply as claimed in claim 1, it is characterized in that, described output holding circuit is voltage follower, one end that second end of the normal phase input end of described voltage follower and described first load resistance and described second siding ring is connected connects, and the inverting input of described voltage follower is connected with its output.
3. the Switching Power Supply as described in claim 1 or 3, it is characterized in that, described Switching Power Supply also comprises control circuit, one end that second end of the test side of described control circuit and described first load resistance and described second siding ring is connected connects, and the control end of described control circuit is connected with the controlled end of described voltage follower; Described control circuit, whether reverse for the voltage signal detecting the output of described current transformer, and when the voltage signal that described current transformer exports is reverse, cut off the output of described voltage follower.
4. Switching Power Supply as claimed in claim 3, it is characterized in that, described control circuit comprises operational amplifier, the in-phase input end of described operational amplifier is connected with the second end of described second siding ring, the reverse inter-input-ing ending grounding of described operational amplifier, the output of described operational amplifier is the control end of described control circuit.
5. Switching Power Supply as claimed in claim 4, it is characterized in that, described voltage follower and described operational amplifier adopt amplifier chip to realize respectively.
6. Switching Power Supply as claimed in claim 1, it is characterized in that, described Switching Power Supply also comprises the first diode, the second diode and the first electric capacity, the anode of described first diode is connected with the first output of the secondary coil of described transformer, and the negative electrode of described first diode is the output of described Switching Power Supply; The anode of described second diode is connected with the second output of the secondary coil of described transformer, and the negative electrode of described second diode is connected with the negative electrode of described first diode; The first end of described first electric capacity is connected with the negative electrode of described first diode, the second end ground connection of described first electric capacity.
7. an electronic equipment, is characterized in that, described electronic equipment comprises the Switching Power Supply as described in claim 1-6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520727979.2U CN205017222U (en) | 2015-09-18 | 2015-09-18 | Switching power supply and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520727979.2U CN205017222U (en) | 2015-09-18 | 2015-09-18 | Switching power supply and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205017222U true CN205017222U (en) | 2016-02-03 |
Family
ID=55215804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520727979.2U Expired - Fee Related CN205017222U (en) | 2015-09-18 | 2015-09-18 | Switching power supply and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205017222U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107479017A (en) * | 2017-09-28 | 2017-12-15 | 国营芜湖机械厂 | A kind of intermediate frequency low-voltage high-current test device |
| WO2020107377A1 (en) * | 2018-11-30 | 2020-06-04 | 北京比特大陆科技有限公司 | Switching power supply |
-
2015
- 2015-09-18 CN CN201520727979.2U patent/CN205017222U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107479017A (en) * | 2017-09-28 | 2017-12-15 | 国营芜湖机械厂 | A kind of intermediate frequency low-voltage high-current test device |
| CN107479017B (en) * | 2017-09-28 | 2023-10-24 | 国营芜湖机械厂 | Medium-frequency low-voltage high-current tester |
| WO2020107377A1 (en) * | 2018-11-30 | 2020-06-04 | 北京比特大陆科技有限公司 | Switching power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205265685U (en) | Power line carrier communication device | |
| CN101388611B (en) | Secondary sampling current control synchronous rectifying driver circuit | |
| CN202840938U (en) | Constant current control circuit capable of power factor correction | |
| CN102386780A (en) | Push-pull circuit of DC/DC (Direct Current/Direct Current) part | |
| CN205017222U (en) | Switching power supply and electronic equipment | |
| CN205319941U (en) | Double - circuit voltage conversion control chip , double - circuit voltage conversion ware and electronic electric energy meter | |
| CN103647454B (en) | Photovoltaic system self powered supply circuit | |
| CN204556715U (en) | A kind of zero cross detection circuit and convertible frequency air-conditioner | |
| CN205123588U (en) | It turns over to keep apart swashs formula high frequency switching power supply and input voltage detection circuitry thereof | |
| CN103647447B (en) | The supply unit of a kind of electric energy table communication module | |
| CN205725459U (en) | A kind of self-adaption switch electric power source flow equalizing circuit | |
| CN102594140A (en) | Slope compensation generating circuit and method | |
| CN201995171U (en) | LED driving power supply with load tracking and frequency reducing functions | |
| CN203135728U (en) | Voltage switching circuit and switch circuit | |
| CN102375091B (en) | Three-phase measurement circuit | |
| CN209030117U (en) | A kind of single-phase Sinusoidal Inverter system adjusted based on feed forward approach | |
| CN209070524U (en) | A kind of low-power consumption isolation type bus takes electric MBUS communication interface circuit | |
| CN209184496U (en) | A kind of digital power multiple-channel output control circuit | |
| CN205921528U (en) | Steady voltage output driver power | |
| CN203368330U (en) | A highly efficient set top box power supply circuit with five path outputs | |
| CN206807284U (en) | A kind of non-bridge PFC circuits | |
| CN206313656U (en) | Digital non-bridge PFC controls circuit | |
| CN205247145U (en) | High accuracy intelligence power control system | |
| CN205003193U (en) | Take accuse intelligent ammeter | |
| CN204131139U (en) | A kind of LED intelligent drive circuit system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160203 Termination date: 20200918 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |